Danny Mayer <ma...@ntp.org> wrote:
> On 12/24/2011 8:10 PM, j...@specsol.spam.sux.com wrote:
>> John Hasler <jhas...@newsguy.com> wrote:
>>>> The open sky nearest the OPERA detector is straight up through 1400m of
>>>> rock.
>>>
>>> Jim Pennino writes:
>>>> And the easiest open sky to get to is horizontally down the tunnel to
>>>> the entrance which is next to a freeway.
>>>
>>> Yes, the entrance is next to a freeway.  The entrance to the LNGS
>>> facility where the OPERA detector is located is near the middle of the
>>> 10 km long Gran Sasso highway tunnel.
>> 
>> The bottom line is that the only thing that is relevant is how easy it is
>> to get to a GPS antenna with an open view of the sky.
>> 
>> Everything else is bloviation.
> 
> GPS is not used for this kind of thing, they are too inaccurate, so it
> doesn't matter. They use atomic clocks.
> 
> Danny

How do you measure distance with an atomic clock?


-- 
Jim Pennino

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